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Required fields in php email form

We have a problem with our web site form getting submitted blank or just a couple of fields.
I would like to make 'required' the fields 'email, name and telephone'.
I thought 'email' was being checked in the code below but it's not.
I have tried all sorts by surfing the web and adding/changing code but not found the solution.

This is the form back to it's original (working) state..
Any ideas?
Thank you

[CODE]
<?php

$my_email = "xxxx@xxxxx.com";

$continue = "/";

$errors = array();

// Remove $_COOKIE elements from $_REQUEST.

if(count($_COOKIE)){foreach(array_keys($_COOKIE) as $value){unset($_REQUEST[$value]);}}